Couldn't find installable ISAM.
An installable ISAM dynamic link library This file is required for operations such as attaching external tables (other than ODBC and Visual Basic/Microsoft Access tables).
An entry in the [Installable ISAM] section in the .INI file isn't valid. For example, this error occurs if you're using a Paradox external database, and the Paradox entry points to a nonexistent directory. Exit the application, correct any invalid entries using Microsoft Windows Notepad or another text editor, and try the operation again.
One of the entries in the [Installable ISAM] section in the .INI file points to a network drive, and that network isn't connected. Check to make sure the network is available, and then try the operation again.